We currently have millions of them in our country called illegal aliens.
No we don't. Citizens are documented, by ie: paper trail. Illegals are undocumented, ie: no paper trial.
I know someone in California employing illegals who are filing tax returns every year. And the feddies send them their refunds to their doors. Basically, illegals with false social security numbers. But most illegals choose to be paid in cash and buy everything in cash. In the past they could get credit cards and bank accounts with false documents, but nowadays the illegals know credit cards are harder to get and who the heck wants a bank account anymore anyway ? What I am basically illustrating is the historical fact that all tyrants create the means of their own eventual destruction. And our feddies are especially good at that. Just look at the National debt for another example.